diff --git a/tine20/Tinebase/Convert/VCalendar/Abstract.php b/tine20/Tinebase/Convert/VCalendar/Abstract.php
index f1e9839122..7ed1c9ca38 100644
--- a/tine20/Tinebase/Convert/VCalendar/Abstract.php
+++ b/tine20/Tinebase/Convert/VCalendar/Abstract.php
@@ -57,18 +57,19 @@ public static function getVObject($blob)
             $blob = stream_get_contents($blob);
         }
         
-        $blob = Tinebase_Core::filterInputForDatabase($blob);
+        $filteredBlob = Tinebase_Core::filterInputForDatabase($blob);
 
         try {
-            $vcalendar = self::readVCalBlob($blob);
+            $vcalendar = self::readVCalBlob($filteredBlob);
         } catch (Sabre\VObject\ParseException $svpe) {
-            // try again with utf8_encoded blob
-            $utf8_blob = Tinebase_Helper::mbConvertTo($blob);
-            // alse replace some linebreaks and \x00's
+            // replace some linebreaks and \x00's
             $search = array("\r\n", "\x00");
             $replace = array("\n", '');
-            $utf8_blob = str_replace($search, $replace, $utf8_blob);
-            $vcalendar = self::readVCalBlob($utf8_blob);
+            $filteredBlob = str_replace($search, $replace, $blob);
+            // try again with utf8_encoded blob
+            $filteredBlob = Tinebase_Helper::mbConvertTo($filteredBlob);
+
+            $vcalendar = self::readVCalBlob($filteredBlob);
         }
         
         return $vcalendar;
diff --git a/tine20/Tinebase/Helper.php b/tine20/Tinebase/Helper.php
index 9e2591e9f3..e5574f1919 100644
--- a/tine20/Tinebase/Helper.php
+++ b/tine20/Tinebase/Helper.php
@@ -261,12 +261,12 @@ public static function in_array_case($_arr, $_str)
      * @param string $encodingTo (default: utf-8)
      * @return string
      */
-    public static function mbConvertTo($string, $encodingTo = 'utf-8')
+    public static function mbConvertTo($string, $encodingTo = 'UTF-8')
     {
         // try to fix bad encodings
         $encoding = mb_detect_encoding((string)$string, 'UTF-8', true);
         if ($encoding !== 'UTF-8') {
-            $encoding = mb_detect_encoding((string)$string, array('UTF-8', 'iso-8859-1', 'iso-8859-15'));
+            $encoding = mb_detect_encoding((string)$string, array('UTF-8', 'ISO-8859-1', 'ISO-8859-15'));
         }
         if ($encoding !== FALSE) {
             $string = @mb_convert_encoding((string)$string, $encodingTo, $encoding);